Atty. Munar invested P280,000 which will be used in a project that will produce a uniform annua revenue of P180,000 for 5 years and then have a salvage value of 15% of the investment. Out of-pocket costs for operation and maintenance will be P80,000 per year. Taxes and insurance wil be 3% of the first cost per year. Atty Munar expects capital to earn not less than 30% before income taxes. Is this a desirable investment? What is the payback period of the investment?